This preview shows pages 1–2. Sign up to view the full content.
Example 21
A dock worker piles 100 kg of salmon at 10°C into a
freezer with a coefficient of performance of 8.6. The
compressor delivers 500 W of power continuously. The
specific heat of the fish is 2.98 kJ/kg°C. The fish freezes
at 2.2°C with a latent heat of fusion of 214 kJ/kg.
a) how long will it take for the fish to reach the
freezing point?
b) how long will it take for the fish to be frozen solid?
Solution:
a) The rate of heat removal from the salmon is
()
in
in
QC
O
P
W
=
±
±
(
)
8.6 500W
4300W
in
Q
==
±
The total heat needed to cool the salmon to the freezing
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview. Sign up
to
access the rest of the document.
 Spring '08
 Kaminski

Click to edit the document details